diff --git a/lib/hcrypto/rsa-imath.c b/lib/hcrypto/rsa-imath.c
index 901e9c359..23d535270 100644
--- a/lib/hcrypto/rsa-imath.c
+++ b/lib/hcrypto/rsa-imath.c
@@ -408,7 +408,7 @@ imath_rsa_private_decrypt(int flen, const unsigned char* from,
 {
     unsigned char *ptr;
     mp_result res;
-    size_t size;
+    int size;
     mpz_t in, out, n, e, b, bi;
     int blinding = (rsa->flags & RSA_FLAG_NO_BLINDING) == 0;
     int do_unblind = 0;
diff --git a/lib/hcrypto/rsa-tfm.c b/lib/hcrypto/rsa-tfm.c
index 796985f8b..32c118c45 100644
--- a/lib/hcrypto/rsa-tfm.c
+++ b/lib/hcrypto/rsa-tfm.c
@@ -321,7 +321,7 @@ tfm_rsa_private_decrypt(int flen, const unsigned char* from,
 {
     unsigned char *ptr;
     int res;
-    size_t size;
+    int size;
     fp_int in, out, n, e;
 
     if (padding != RSA_PKCS1_PADDING)